Research Paper: High-dose Vitamin D Supplementation and Improvement in Cognitive Abilities, Insomnia, and Daytime Sleepiness in Adolescent Girls

1. Cellular and Molecular Research Center, School of Medicine, Birjand University of Medical Sciences, Bijand, Iran. 2. Department of Neurology, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 3. Department of Traditional Medicine, School of Persian and Complementary Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 4. Endocrine Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 5. Biochemistry of Nutrition Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 6. Chinese and Complementary Medicine Research Center, School of Traditional and Complementary Medicine, Mashhad University of Medical Sciences, Mashhad, Iran. 7. Division of Medical Education, School of Brighton & Sussex Medical, University of Brighton and the University of Sussex, Falmer, Brighton, Sussex, UK. 8. Metabolic Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.